html, body {

}

body {
    background-image: url("../../img/login_back.jpg");
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
}

/*媒体查询，修改大小*/
@media (max-height: 1000px) {
    .content {
        width: 300px;
        height: 550px;
        left: 40%;
        top: 15%;
        position: absolute;
        -webkit-transform-style:preserve-3d;
        transform-style: preserve-3d;
        -webkit-transition: transform 1s;
        -moz-transition: transform 1s;
        -o-transition: transform 1s;
        transition: transform 1s;
        -webkit-transform-origin:50% 50% -150px;
        transform-origin: 50% 50% -150px;
    }
}

@media (max-width: 800px) {
    .content {
        width: 270px;
        height: 495px;
        left: 40%;
        top: 5%;
        position: absolute;
        -webkit-transform-style:preserve-3d;
        transform-style: preserve-3d;
        -webkit-transition: transform 1s;
        -moz-transition: transform 1s;
        -o-transition: transform 1s;
        transition: transform 1s;
        -webkit-transform-origin:50% 50% -150px;
        transform-origin: 50% 50% -150px;
    }
}

@media (max-width: 500px) {
    .content {
        width: 240px;
        height: 440px;
        left: 40%;
        top: 5%;
        position: absolute;
        -webkit-transform-style:preserve-3d;
        transform-style: preserve-3d;
        -webkit-transition: transform 1s;
        -moz-transition: transform 1s;
        -o-transition: transform 1s;
        transition: transform 1s;
        -webkit-transform-origin:50% 50% -150px;
        transform-origin: 50% 50% -150px;
    }
}

@media (max-height: 650px) {
    .content {
        width: 270px;
        height: 495px;
        left: 40%;
        top: 5%;
        position: absolute;
        -webkit-transform-style:preserve-3d;
        transform-style: preserve-3d;
        -webkit-transition: transform 1s;
        -moz-transition: transform 1s;
        -o-transition: transform 1s;
        transition: transform 1s;
        -webkit-transform-origin:50% 50% -150px;
        transform-origin: 50% 50% -150px;
    }
}

@media (max-height: 520px) {
    .content {
        width: 240px;
        height: 440px;
        left: 40%;
        top: 5%;
        position: absolute;
        -webkit-transform-style:preserve-3d;
        transform-style: preserve-3d;
        -webkit-transition: transform 1s;
        -moz-transition: transform 1s;
        -o-transition: transform 1s;
        transition: transform 1s;
        -webkit-transform-origin:50% 50% -150px;
        transform-origin: 50% 50% -150px;
    }
}

@media (max-height: 470px) {
    .content {
        width: 210px;
        height: 385px;
        left: 40%;
        top: 5%;
        position: absolute;
        -webkit-transform-style:preserve-3d;
        transform-style: preserve-3d;
        -webkit-transition: transform 1s;
        -moz-transition: transform 1s;
        -o-transition: transform 1s;
        transition: transform 1s;
        -webkit-transform-origin:50% 50% -150px;
        transform-origin: 50% 50% -150px;
    }
}
.stage {
    perspective: 800px;
}
/*注意，要实现3D翻转，需要指定绝对位置，然后将几张图片都叠在一起，之后再进行相应的翻转和移动*/
.login {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: -webkit-linear-gradient(top, rgba(146, 135, 187, 0.8) 0%, rgba(0, 0, 0, 0.5) 100%); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(top, rgba(146, 135, 187, 0.8) 0%, rgba(0, 0, 0, 0.5) 100%); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(top, rgba(146, 135, 187, 0.8) 0%, rgba(0, 0, 0, 0.5) 100%); /* Firefox 3.6 - 15 */
    background: linear-gradient(top, rgba(146, 135, 187, 0.8) 0%, rgba(0, 0, 0, 0.5) 100%); /* 标准的语法（必须放在最后） */
}

.check_mark {
    width: 100%;
    height: 50%;
    position: absolute;
}

.left_mark {
    position: absolute;
    width: 22%;
    height: 10%;
    background: -webkit-linear-gradient(left, white, rgba(12, 6, 6, 0.05)); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(left, white, rgba(12, 6, 6, 0.05)); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(left, white, rgba(12, 6, 6, 0.05)); /* Firefox 3.6 - 15 */
    background: linear-gradient(left, white, rgba(12, 6, 6, 0.05)); /* 标准的语法（必须放在最后） */
    left: 26%;
    top: 52%;
    transform: rotate(57grad);
}

.right_mark {
    position: absolute;
    width: 50%;
    height: 10%;
    background-color: white;
    left: 33%;
    top: 45%;
    transform: rotate(-45grad);
}

.login_form {
    position: absolute;
    top: 50%;
    width: 80%;
    height: 50%;
    margin: 0 5%;
}

.login_username {
    margin-left: 5%;
    padding-top: 3%;
    width: 100%;
    height: 13%;
    border-bottom: 1px solid gray;
}

svg.login_icon {
    margin-top: 1%;
    float: left;
    width: 10%;
    height: 70%;
    padding-top: 1%;
    margin-right: 6%;
}

svg.login_icon path {
    stroke: rgba(255, 255, 255, 0.9);
    fill: none;
}

input.input_username {
    font-size: 1em;
    width: 80%;
    height: 90%;
    background-color: transparent;
    border: none;
    color: white;
}

.login_password {
    margin-top: 3%;
    margin-left: 5%;
    padding-top: 3%;
    width: 100%;
    height: 14%;
    border-bottom: 1px solid gray;
}

svg.password_icon {
    margin-top: 1%;
    float: left;
    width: 10%;
    height: 70%;
    padding-top: 1%;
    margin-right: 6%;
}

svg.password_icon path {
    stroke: rgba(255, 255, 255, 0.9);
    fill: none;
}

input.input_password {
    font-size: 1em;
    width: 80%;
    height: 90%;
    background-color: transparent;
    border: none;
    color: white;
}

.login_button_div {
    margin-left: 4%;
    padding-top: 3%;
    width: 100%;
    height: 14%;
    margin-top: 2%;
}

.login_button {
    width: 100%;
    height: 100%;
    background-color: mediumvioletred;
    color: white;
    border: none;
    border-radius: 20px;
}

.login_button:active {
    border: none;
}
div.go_forget_password {
    margin-top: 5%;
    margin-left: 4%;
    padding-top: 3%;
    width: 100%;
    height: 14%;
    text-align: right;
}
a.go_to_forget{
    color: white;
    text-decoration: none;
}
.register_info {
    margin-left: 4%;
    width: 100%;
    height: 14%;
    text-align: center;
    margin-top: 8%;
    font-size: 16px;
    color: gray;
}

.register_info a {
    color: white;
    text-decoration: none;
}

input {
    outline: none;
}

button {
    outline: none;
}

button:hover {
    cursor: pointer;
}


.placeholder::-webkit-input-placeholder{
    color: #e60200;
}
.placeholder::-moz-placeholder{
color: #e60200;
}
.placeholder:-ms-input-placeholder{
color: #e60200;
}